Rock Stars or R/S.... You need to pass 3, Look At Me... to get to 6, Crack star. Most people use the 6 to try for 10K or 25K likes. Which is a good thing... No matter what level you are you will need it later. :)
You can also take years to run 6 back to back... The key is to comit not to run any other bling until you have run all 6 r/s.... It takes a full 24 hours to run them all in 1 day... and you can't start any bling once you have hit start on your first r/s.... So you can run 1 a year for six years if you don't use any other bling and still get look at me and crack star....
By going for Look at me and Crack star together you save the cost of 3 r/s... 105 credits
Remember to have fun.
If you have any questions ask.
Good Luck